IPv4 decision library
Research public and private IPv4, leasing and purchase choices, address reputation, RIR requirements, routing, RPKI, LOAs, and day-to-day network responsibilities.
What this library covers
Market context, commercial choices, registry readiness, and operational controls—without treating external approval, reputation, or availability as guaranteed.
178 published guides
Choose by task
Use the library for context, then continue to the product or operating workflow that matches your responsibility.
Start with: How to find my IPv4Model block size, term, setup, and operating assumptions before requesting capacity.
Search current public listings and review the evidence and responsibilities attached to each path.
Understand authority, routing, records, acceptance, abuse response, and renewal ownership.
Use practical guidance for RIR records, routing, RPKI, LOAs, reputation, and support workflows.
From the library
New and updated articles are ordered by publication date. Open the guide that matches your current question.
Latest guide
If your organization holds unused or underused IPv4 address space, one of the most important questions is:How much are my IPv4 addresses worth in 2026?There is no single fixed market price for an IPv4 address.The achievable value of an IPv4 block depends on the specific resource being offered, inclu
Transferring IPv4 address space from one organization to another involves more than agreeing on a prefix and a price. A successful IPv4 transfer may require documentation showing who the parties are, who is authorized to act for them, which IPv4 resources are involved, whether the source is entitled
Learn what network attached storage (NAS) is, how it connects to private and public networks, and what to check before enabling remote access.
Understand botnets, detection signals and IP attribution limits. Plan abuse-response responsibilities and reputation recovery when operating leased IPv4.
Learn how to find an IP abuse contact, write a useful report, verify evidence, contain incidents, and divide responsibility for leased IPv4 space.
Completing an IPv4 transfer does more than move address space from one organization to another. It changes the administrative relationship around the IPv4 block—and that can affect multiple records and services associated with the resource. After an IPv4 transfer, organizations may need to review or
Learn what a Letter of Authorization (LOA) does in IP networking, when providers request it, and how it differs from contracts, ROAs, IRR, and BGP routes.
Most businesses should size IPv4 by starting at a /24 — the smallest block the global Internet will reliably route — and sizing up from there based on how many addresses their actual services consume, plus room for growth. A /24 provides 256 addresses; each step up roughly doubles that. The right si
Learn what a datacenter IP is, how it differs from residential IP space, how providers classify addresses, and which evidence to verify before use.
Two IPv4 blocks can have the same prefix size, similar market value, and equally willing buyers and sellers—yet require different transaction preparation. The reason is that an IPv4 transaction does not exist only at the commercial layer. The address block is also registered within a Regional Intern
A proxy relays app traffic; a VPN protects selected traffic between tunnel peers. Compare encryption, IP visibility, DNS, speed, privacy, and uses.
Learn what CGNAT means, how to detect upstream NAT, why inbound access varies, and when IPv6, port mapping, or a public IP can help.
